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24 Cards in this Set
- Front
- Back
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Matter
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Anything that has mass and occupies space.
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Chemistry
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The study of the properties of matter and how matter changes.
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Physical Property
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A characteristics of a substance that can be observed without changing the substance into another substance.
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Chemical Property
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A characteristic of a substance that describes its ability to change into different substances.
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Physical Change
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A change that alters the form or appearance of a material but does not make the material into another substance.
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Chemical Reaction
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The process in which substances undergo chemical changes that result in the formation of new substances.
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Precipitate
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A solid that forms from a solution during a chemical reaction.
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Endothermic Reaction
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A reaction that absorbs energy in the form of heat.
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Exothermic Reaction
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A reaction that releases energy in the form of heat.
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Chemical Equation
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A short, easy way to show a chemical reaction, using symbols
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Reactant
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A substance that enters into a chemical reaction.
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Product
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A substance formed as a result of a chemical reaction.
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Conservation of Mass
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The principle stating that matter is not created or destroyed during a chemical reaction.
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Open System
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A system in which matter can enter from or escape to the surroundings.
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Closed System
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A system in which no matter is allowed to enter or leave.
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Coefficient
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A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
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Synthesis
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A chemical reaction in which two or more simple substances combine to form a new, more complex substance.
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Decomposition
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A chemical reaction that breaks down compounds into simpler products.
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Replacement
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A reaction in which one element replaces another in a compound or when two elements in different compounds trade places.
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Activation energy
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The minimum amount of energy needed to get a chemical reaction started.
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Concentration
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A mixture of one material in a certain volume of another material.
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Catalyst
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A material that increases the rate of a reaction by lowering the activation energy.
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Enzyme
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A biological catalyst that lowers the activation energy of reactions in cells.
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Inhibitor
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A material that decreases the rate of a reaction.
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